Re: "pick" but across multiple folders

> I recall a bunch of people doing free text search methods, back before
> google was a thing.

Have you tried mairix?  I've contributed the odd patch to it so it will
even index your .mmdf.xz archives among other things.  Creates a new
search result folder (+s in my case) containing symlinks or copies of
emails.  This would find all emails containing "word" in the last three
months for example:

  mairix d:3m- word

Conrad